<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="isall" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <tr
          is="mytr"
          :arr="goodList"
          v-for="(item, index) in goodList"
          :key="index"
          :obj="item"
          :index="index"
          @zheng="zheng(index)"
          @fu="fu(index)"
          @get="get(index)"
        ></tr>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:{{ supertop }}</td>
          <td colspan="5"></td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import mytr from "./components/shop";
export default {
  components: {
    mytr,
  },
  methods: {
    zheng(ind) {
      this.goodList[ind].num++;
    },
    fu(ind) {
      this.goodList[ind].num > 1 && this.goodList[ind].num--;
    },
    get(ind) {
      this.goodList.splice(ind, 1);
    },
    small() {},
  },
  computed: {
    supertop() {
      return this.goodList.reduce((sum, obj) => {
        if (obj.checked == true) {
          sum += obj.price * obj.num;
        }
        return sum;
      }, 0);
    },
    isall: {
      set(check) {
        this.goodList.forEach((sum) => (sum.checked = check));
      },
      get() {
        return this.goodList.every((obj) => obj.checked === true);
      },
    },
  },
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
};
</script>

<style>
</style>